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MAX4172
Low-Cost, Precision, High-Side Current-Sense Amplifier
Low-cost, Precision Current Monitoring For Portable Battery-Powered Applications
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Status
Active: In Production.
Description
The MAX4172 is a low-cost, precision, high-side current-sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the battery charger's ground path. Wide bandwidth and ground-sensing capability make the MAX4172 suitable for closed-loop battery-charger and general-purpose current-source applications. The 0V to 32V input common-mode range is independent of the supply voltage, which ensures that current-sense feedback remains viable, even when connected to a battery in deep discharge.
To provide a high level of flexibility, the MAX4172 functions with an external sense resistor to set the range of load current to be monitored. It has a current output that can be converted to a ground-referred voltage with a single resistor, accommodating a wide range of battery voltages and currents.
An open-collector power-good output (active-low PG) indicates when the supply voltage reaches an adequate level to guarantee proper operation of the current-sense amplifier. The MAX4172 operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin µMAX® or SO package.
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Data Sheet
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Key Features
- Low-Cost, Precision, High-Side Current-Sense Amplifier
- ±0.5% Typical Full-Scale Accuracy Over Temperature
- 3V to 32V Supply Operation
- High Accuracy +2V to +32V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
- 800kHz Bandwidth [VSENSE = 100mV (1C)]
200kHz Bandwidth [VSENSE = 6.25mV (C/16)]
- Available in Space-Saving µMAX and SO Packages
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Applications/Uses
- Battery-Powered Applications
- Closed-Loop Battery Chargers/Current Sources
- Energy Management
- Portable PCs: Notebooks, Subnotebooks, Palmtops
- Portable Test/Measurement Systems
- Portable/Cellular Phones
- Smart Battery Packs/Chargers
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Key Specifications:
| Current Sense Amplifiers |
| Part Number |
CMVR
(V) |
CMVR
(V) |
VCC
(V) |
VCC
(V) |
ICC
(µA) |
Bi-Dir. Curr. Sense |
VSENSE_FS
(mV) |
VOS @25°C
(µV) |
Gain |
Gain Accuracy @25°C
(%) |
BW
(kHz) |
Comp-
arators |
Oper. Temp.
(°C) |
Package/Pins |
Budgetary Price |
| min |
max |
min |
max |
typ |
recomm. |
max |
max |
@ -3dB |
See Notes |
| MAX4172 |
0 |
32 |
3 |
32 |
800 |
No |
150 |
750 |
10 µA/mV |
2 |
800 |
0 |
-40 to +85 |
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$1.56 @1k |
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See All Current Sense Amplifiers (36)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX4172ESA
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX4172ESA+
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX4172ESA+T
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX4172ESA-T
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX4172EUA
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX4172EUA+
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX4172EUA+T
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX4172EUA-T
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-1184
Rev 1;
2010-08-05
This page last modified: 2011-04-07
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